Re: [Pana] I-D Action: draft-yegin-pana-unspecified-addr-05.txt
Yasuyuki Tanaka <yatch@isl.rdc.toshiba.co.jp> Thu, 09 February 2012 11:46 UTC
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Date: Thu, 09 Feb 2012 20:45:57 +0900
From: Yasuyuki Tanaka <yatch@isl.rdc.toshiba.co.jp>
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To: Alper Yegin <alper.yegin@yegin.org>
References: <20111216133844.32034.20748.idtracker@ietfa.amsl.com> <35748338-4BE5-40AD-96C4-EAE501162372@yegin.org> <DB9259A8-E3E1-4A92-805D-1C8A21D03D44@um.es> <4025A151-3A1E-431F-8DB9-798EE717E2FA@yegin.org> <B0A66B63-E291-4704-9BE4-1B4345BC475C@um.es> <4F335D45.7040404@isl.rdc.toshiba.co.jp> <3882200C-6C19-4775-9BFA-E3ADC9CC2829@yegin.org>
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Subject: Re: [Pana] I-D Action: draft-yegin-pana-unspecified-addr-05.txt
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Hello, > The largest PANA message is possibly not the very first PAR > from the PAA (unlike the current draft states). Such a PAR can > be carrying a EAP-Request/Identity, hence not really be caring > a minimum EAP MTU size. A subsequent PAR can be carrying > that (and it'd not have the Integrity-Algorithm, PRF-Algorithm, > and Token AVPs). > > Are you using the same reasoning for your above suggestion? Yes. To shorten a PANA Message, we can send an EAP-Payload AVP in another PANA Message. Strictly speaking, RFC 5191 has no upper limit on the number of PRF-Algorithm AVPs and Integrity-Algorithm AVPs which are contained in a PAR. The size of a PANA message might be the maximum size of the UDP data... Is this correct? [Figure 4, RFC 5191] The table uses the following symbols: 0 The AVP MUST NOT be present in the message. 0-1 Zero or one instance of the AVP MAY be present in the message. It is considered an error if there is more than one instance of the AVP. 1 One instance of the AVP MUST be present in the message. 0+ Zero or more instances of the AVP MAY be present in the message. +---------------------------+ | Message Type | +---+---+---+---+---+---+---+ Attribute Name |PCI|PAR|PAN|PTR|PTA|PNR|PNA| ----------------------+---+---+---+---+---+---+---+ AUTH | 0 |0-1|0-1|0-1|0-1|0-1|0-1| EAP-Payload | 0 |0-1|0-1| 0 | 0 | 0 | 0 | Integrity-Algorithm | 0 |0+ |0-1| 0 | 0 | 0 | 0 | Key-Id | 0 |0-1|0-1| 0 | 0 | 0 | 0 | Nonce | 0 |0-1|0-1| 0 | 0 | 0 | 0 | PRF-Algorithm | 0 |0+ |0-1| 0 | 0 | 0 | 0 | Result-Code | 0 |0-1| 0 | 0 | 0 | 0 | 0 | Session-Lifetime | 0 |0-1| 0 | 0 | 0 | 0 | 0 | Termination-Cause | 0 | 0 | 0 | 1 | 0 | 0 | 0 | ----------------------+---+---+---+---+---+---+---+ Figure 4: AVP Occurrence Table Best, Yasuyuki Tanaka (2012/02/09 18:11), Alper Yegin wrote: > Hello, > > Thank you for the review and feedback. > > On Feb 9, 2012, at 7:44 AM, Yasuyuki Tanaka wrote: > >> Hi all, >> >> I have four comments about the draft. I put them at the bottom of >> this mail. Please see them. >> >> Best, >> Yasuyuki Tanaka >> >> --------------------------------------------------------------------- >> >> (1) Page 4, Paragraph 1 >> It would be helpful to add text about the source port number and the >> destination port number of the PCI as below. >> >> [edited] >> Step 1: The PaC initiates PANA by sending a broadcasted PCI carrying >> a Token AVP that contains a random value generated by the PaC. >> >> ! The source IPv4 address of the PCI is set to 0.0.0.0. The source >> ! port number is chosen by the PaC. The destination IPv4 address is >> ! set to 255.255.255.255. The destination port number is the PANA port >> ! number (716). >> >> [original] >> Step 1: The PaC initiates PANA by sending a broadcasted PCI carrying >> a Token AVP that contains a random value generated by the PaC. >> >> The source IPv4 address of the PCI is set to 0.0.0.0. The >> destination IPv4 address is set to 255.255.255.255. >> > > > OK. > >> --------------------------------------------------------------------- >> >> (2) Figure 1, Page 4 >> >> If the PAA want to initiate re-authentication, PAA have to know PaC's >> IPv4 address which is configured by DHCP. >> >> It would be better that Figure 1 has messages related to "PaC Updating >> Its IP Address" described in Section 5.6, RFC 5191. >> >> [Section 5.6. in RFC 5191] >> After the PaC has changed its IP address used for PANA, it MUST send >> any valid PANA message. If the message that carries the new PaC IP >> address in the Source Address field of the IP header is valid, the >> PAA MUST update the PANA session with the new PaC address. If there >> is an established PANA SA, the message MUST be protected with an >> AUTH AVP. > > > Let us consider that. > >> --------------------------------------------------------------------- >> >> (3) Page 6, Paragraph 3 >> >> I have no idea which PAR should have 'I' bit. Every PAR sent by >> PAA should have 'I' bit? Or, only a PAR with 'C' bit should have >> 'I' bit? (I think the latter is preferable.) >> >> I've referred to RFC 5191, but I've not found the answer. >> > > I think this is an ambiguity with the RFC 5191. PAR with 'C' bit makes sense. > > >> [original] >> The PAA SHALL set the 'I' (IP Reconfiguration) bit of PAR messages >> in authentication and authorization phase so that the PaC proceeds >> to IP address configuration. >> >> --------------------------------------------------------------------- >> >> (4) Page 6, Paragraph 7 >> I don't think that the description about the size of the largest PANA >> is correct. This is because the initial PAR could have multiple >> Integrity-Algorithm AVPs and PRF-Algorithm AVPs. This specification is >> described in Section 4.1, RFC 5191. >> >> [Section 4.1. in RFC 5191] >> the PAA sends the initial PANA-Auth-Request carrying one or more >> PRF-Algorithm AVPs and one or more Integrity-Algorithm AVPs for the >> PRF and integrity algorithms supported by it, respectively. >> >> In my understanding, it is sufficient to consider a PANA Message which >> has only one EAP-Payload AVP for "Message Size Considerations". In >> other words, the minimum PANA MTU size is equivalent to the size of a >> PANA message which has only one EAP-Payload AVP. >> > > > We are trying to find the the size of the largest PANA message. > The largest PANA message is possibly not the very first PAR from the PAA (unlike the current draft states). > Such a PAR can be carrying a EAP-Request/Identity, hence not really be caring a minimum EAP MTU size. > A subsequent PAR can be carrying that (and it'd not have the Integrity-Algorithm, PRF-Algorithm, and Token AVPs). > > Are you using the same reasoning for your above suggestion? > > Alper > > > >> --------------------------------------------------------------------- >> >> >> _______________________________________________ >> Pana mailing list >> Pana@ietf.org >> https://www.ietf.org/mailman/listinfo/pana >
- [Pana] Fwd: I-D Action: draft-yegin-pana-unspecif… Alper Yegin
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Rafa Marin Lopez
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Alper Yegin
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Rafa Marin Lopez
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Yasuyuki Tanaka
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Alper Yegin
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Yasuyuki Tanaka
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Alper Yegin
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Yoshihiro Ohba
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Alper Yegin
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Yoshihiro Ohba
- [Pana] Fwd: Re: I-D Action: draft-yegin-pana-unsp… Yoshihiro Ohba
- Re: [Pana] Fwd: Re: I-D Action: draft-yegin-pana-… Yoshihiro Ohba
- Re: [Pana] I-D Action: draft-yegin-pana-unspecifi… Alper Yegin